advanced permissions on file set give error

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site has 3 file sets.
non admin user logs in, can see the first 2 file sets.
on 3rd file set user gets core exception, see screenshot.
I have deleted that file set and created it anew, same error occurs.

Solved: there were 2 files in that 3rd file set where C5 did not show permissions when I wanted to change them back and forth. I removed those 2 files, and now user can see into 3rd file set without core exception.

The question remains what has been wrong with that 2 files, why C5 did not react when i wanted to change their permissions. My naive guess would be, a C5 internal timeout happening when switching on advanced permissions, resulting in incomplete permission assignment onto existing files.

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Status: New

concrete5 Environment Information

# concrete5 Version
Core Version - 8.4.3
Version Installed - 8.4.3
Database Version - 20180716000000

# concrete5 Packages
Clarity (0.1.14), Cookies Notice (1.3.2), Kontakt (0.1.0)

# concrete5 Overrides
blocks/autonav/templates/clarity navigation/view.php, blocks/autonav/templates/clarity navigation, blocks/autonav/templates, blocks/autonav, blocks/page_list/templates/course_list/view.php, blocks/page_list/templates/course_list, blocks/page_list/templates, blocks/page_list, controllers/single_page

# concrete5 Cache Settings
Block Cache - On
Overrides Cache - On
Full Page Caching - On - If blocks on the particular page allow it.
Full Page Cache Lifetime - Only when manually removed or the cache is cleared.

# Server Software
Apache

# Server API
fpm-fcgi

# PHP Version
7.0.32-nmm1

# PHP Extensions
bcmath, bz2, calendar, cgi-fcgi, Core, ctype, curl, date, dba, dom, exif, fileinfo, filter, ftp, gd, gender, gettext, gmp, hash, htscanner, http, iconv, imagick, imap, interbase, intl, ionCube Loader, json, ldap, libxml, mailparse, mbstring, mcrypt, mongodb, mysqli, mysqlnd, OAuth, odbc, openssl, pcre, PDO, pdo_dblib, pdo_mysql, PDO_ODBC, pdo_pgsql, pdo_sqlite, pgsql, Phar, posix, propro, pspell, raphf, recode, Reflection, session, shmop, SimpleXML, soap, SourceGuardian, SPL, sqlite3, standard, sysvsem, sysvshm, tidy, tokenizer, wddx, xml, xmlreader, xmlwriter, xsl, zip, zlib

# PHP Settings
max_execution_time - 30
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 60
max_input_vars - 3000
memory_limit - 256M
post_max_size - 200M
sql.safe_mode - Off
upload_max_filesize - 200M
ibase.max_links - Unlimited
ibase.max_persistent - Unlimited
ldap.max_links - Unlimited
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
odbc.max_links - Unlimited
odbc.max_persistent - Unlimited
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
pgsql.max_links - Unlimited
pgsql.max_persistent - Unlimited
raphf.persistent_handle.limit - -1
session.cache_limiter - <i>no value</i>
session.gc_maxlifetime - 7200
soap.wsdl_cache_limit - 5

Browser User-Agent String

Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Firefox/60.0